Why Does My Other Software Exported Heightmap Displace My Mesh So Much In Blender?
This looks to me like a color transform is being applied your displacement map prior to displacement. Don't save your height map as sRGB. I would also save the file itself as OpenEXR. Don't use PNG / JPG / other garbage formats.
Lastly, make sure the color space value of your displacement map texture is set to &quot;Non-Color&quot; before hooking it up.